Dobby finger for looms



Oct. 6, 1931, A. A. GORDON 1,825,313

I DOBBY FINGER FOR LOOMS Filed Dec. 19. 195o K A n Patented Oct. 6, 1931 n ,UNITDSTATES PATENT OFFIfin-y y ALBERT' A. Gonnoiv, OF woncESTER, MASSAOTTUSETTS, ASsIGNoR To CBOMPTON an KNOWLES Looivr- WORKS, orv wOnonSTnnv MnsSncHUSETTs, A CORPORATION Yor",

:MASSACHUSETTS y BOBBY FINGER ronnOoMs l'npplication filed-December 19,1930'. SerialNo. 503,539.

rIhis invention relates .to improvementsjin dobby fingers for looms and itzis the general object of theinvention to Afacilitate the manufacture 'of pressed Steel fingersto the end that they may be more eiicien-tly andaccurately assembled. Loom dobbies usually operate with a plu-A ral-ity of 'so-'called fingers which: are acted upon directly by the pattern mechanism, such for instance,- asar chain provided with pegs. The ngershave their under sides grooved so as to maintain engagement'with thepegs as the latter `move underth-em andit is an important object ofmy presentinvention to provide a: fin-ger the major part of which is made `ofrelatively soft Sheet steel but the peg en-V gaging-rim of whichis made of rela-tively hard steel. In previous constructionsof this kind-'the hardened steel part has been located u 2o between the folded sides of the finger' body andztliis construction has required the runto be held? inwposition while the bending of the outer inclosingsheath wasy being completed. It isanother object of my present invention 225 to make the finger so ythat thefhardenedrun can be applied toon'e sidev ofthe'finger after the folding of the finger body has been corny VIn*previous*constructions the groove of the run hasbe'en made by folding` together opposite' edges ofa relatively thin piece of hard ened steelso thatthe peg has not had Contact across-the whole of its upper end withmetal, therebyv causing uneven wear. i It is another v'object of my presentinvention to 'provide a run which willr have acontinuous Surfaceto engage the peg,;thus insuring uniformityof wear.Y

With these and other objects in view which will appear Y as the description proceeds, my invention resides in the combination and ar-V rangement of parts hereinafter described and setforth in the claims- Y Y l the accompanying drawings, wherein ya convenient embodiment of my invention is set forth, y Fig. 1 lis a front elevation of a dobby equipped with fingers made according tomy present invention, i f i c I' f Fig; is a fragmentary topplan view taken from the direction o-f arrow 2, Figl, and on enlarged scale, Y u Fig. 3 is a front elevation of a dobby finger made according to my present invention,

Fig. 4 is a top plan view of the finger shown in Figf, p l

Figs. 5 and 6 are enlarged vertical sections on lines 5-5 and6`--6', respectively, of Fig. 3, Fig.4 7 isa plan of the blank which forms the outer folded and inclosin'gpart `of thel having a back lever 22 pivoted thereto as at 23; The upper and lower endsof the lever have pivoted thereto hooks QLQandQVrespectively, which are adapted for co-action with oppositelyy reciprocating f knives 26. The lower hooks are adapted for the upturne'd tail 27 of one form of figure, whereas the upper hooks aire controlled by yrods Q8 the lower end of which havey engagement withra straight tail 29 formed `as part of another type of finger. A pattern mechanism designated generally at 30 is provided with, finger liftingpegs 31 of the usual form, and a comb 32y having guide pins 33 for the fingers may also be employed. The sequence of pegsBl under the several fingers determines the order in which the harness jacks 20 shallbe kmoved and thus control the shedding of the fingers which are rendered necessary by the fact that the hooks are controlled in different ways, yet the essential features of my invention are the same for both of these fingers and I will therefore describe the invention with relation to but one of them. namely, that which controls the lifter rod 28.

Referring to Fig. 3, it will be seen that I have provided a central filler 40 having a weighted wing 4l to lie between the pins 33. In the instance illustrated the filler has an inwardly extending tail 42 shown at the left at Fig. 8 and also has a downwardly opening slot 43 to receive a fixed supporting shaft 44 around which the fingers move as a pivot. rI`he filler forms the central part of the finger and the wing 41 is preferably sufficiently heavy to assist the other parts of the finger in overbalancing the weight of the rod 28 and the associated hook 24. The lower edge of the filler lying between the slot land the wing 41 mav be arcuate, as at 45.

Surrounding a portion of the Eller is an inclosing sheath member which. as shown in Fig. 5, is generally U-sbaped in vertical cross section. The sheath movided with open slots 51 designed to register with the slot 43. Extending inwardly from the slots are two arms 52 substantially the same as the corresponding part 42 of the filler. The sheath may have an arcuate edge 58 on one side similar to edge 45 of the filler, while the ether side is cut out to form a large notch 54, Fig. 7. A short slot shown at the right hand end of Fig. 7 is provided to receive a partof the wing 41.

The run R which engages the pegs is shown particularly in Fig. 9 and comprises an upright wall 60 from the lower edge of which extends an arcuate. bent edge 61 the lower surface of which is concave in a direction transversely of the finger for the purpose of receiving the pegs 31. .i he arcuate curvature of the bend 61 corresponds to the edges 45 and 53 of the filler and sheath, respectively.

In assembling the finger, the filler 40 is placed within the previously folded sheath se that it assumes the position shown in Fig. 5, the slots 51 registering with the slet 48 and the arms 42 and 52 also being in register. These parts may then be welded togo at W.y The run R is then positioned as indicated in Figs. 3 and 5 in notch 54 with the lower arcuate run 61 extendingunder the filler and projecting over to the arcuate edge The run is provided with opposite vertical edges 62 which engage edges 63 on the sheath while the upper edge 64 of the run engages the top edee G5 of the notch illustrated in Fig. 7. The run is then welded in position to the filler and sheath. indicated at X in Fig. 8, the outer surface Gti of the vertical wall G0 of the run being flush with the corresponding surface (i7 of the sheath.

In this way that side of the finger which has the run applied thereto is smooth and will move without interfering with the adjacent finger.

From the foregoing it will be seen that I have provided a form of pressed metal debby finger wherein the sheath may be bent to final form prior to assembly and that the run for the pegs 31 is inserted in a notch defined in ene of the vertical walls of the sheath. In thisway the run can be easily assembled without the necessity of a bending operation on the part of the sheath after the run is in position. It will also be seen that by means of a construction set forth herein the groove in the lower side of the bend 61 is continuous from one side to the other of the finger so as to provide contact with the top of the pegs 31 such as will result in uniform wear of the latter. y

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to belirnited to the details herein disclosed, but what I claim is:

1. In a dobby finger, an inclosing sheath of U-sh aped cross section., one of the sides of the U having an opening therein, and a peg run set into the opening and secured with respect to the sheath.

2. In a dobby finger, an outer inclosing sheath formed generally of U-shaped cross section, a filler located between the sides of the sheath, one of the sides of the latter having an opening therein. and a peg run inserted in the opening and having a pegl groove and held rigidly with respect to the sheath and the filler.

3.*In a dobby finger. a peg runl element having the lower edge thereof bent to form a groove 0f continuous arcuate form from one side to the other thereof so as t0 present a. continuous wearing surfaceto the peg of the dobby chain, and a dobby finger body to which the sun is secured.

4. In a dobby finger, means defining a body for the finger, and a separate peg run element extending from one side of the body across to the other side and having a peg receiving groove for-med therein.

5. In a dobby finger, means defining a body for the finger, and a separate peg run element extending from one side of the body across to the other side and having a peg rcceiving groove formed therein which is continuous from one side to the other of the finger to 'present uniform wearing surface to the peg of a dobby chain.

6. In a dobby finger, means defining al body for the finger, and a separate peg run element extending from one side of the body across to the other side and having a peg receiving groove formed therein, the run ele- Y from one side of the nger to the other side thereof.

In testimony whereof I have hereunto afxed my signature. y

v ALBERT A. GORDON.y 

